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Join Date: Oct 2003
Location: Michigan
Posts: 14,093
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Stuck bolts in magnesium case-Mercedes
Helped a fellow Pelican this morning crack a transfer case to investigate a noise.
The biggest hurdle is getting what's left of the case bolts out. We cut the heads off to split the case but, tried penetrant, heat, everything we could think but we could not get the threaded portion to unscrew. I could move each one a tiny bit back and forth but they would not turn out. Any ideas on how we might get these out. Drilling through the bolts is possible but would take a very long time(x5). We would also risk damaging the threads.
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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07-16-2011, 10:23 AM
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Registered
Join Date: Jan 2006
Location: Fullerton,Ca
Posts: 5,463
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" Formerly we suffered from crime. Today we suffer from laws" (55-120) Tacitus |
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07-16-2011, 10:47 AM
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19 years and 17k posts...
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I don't know if there are any shops left in SE MI that do EDM (electrical discharge machining)...
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Art Zasadny 1974 Porsche 911 Targa "Helga" (Sold, back home in Germany) Learning the bass guitar Driving Ford company cars now... www.ford.com |
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07-16-2011, 10:59 AM
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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,189
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carbide tipped Dremel --carefully
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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07-16-2011, 11:59 AM
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You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,848
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I've used oxy-act to heat it up, and then quickly sprayed WD-40 on the threads.
BIG risk of FIRE and/or permanent damage, but the lube seems to penetrate better. The same might work with an air duster or dry ice on the stud. The idea being to quickly cool it to break the corrosion bond. Coke(diet?) is supposed to be acidic enough to eat through rust and mineral deposits. When it gets down to flush, I haven't had much success with the reverse drill/easyouts. The square ones driven in seem to have more bite. Just some ideas. Good luck. |
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07-16-2011, 12:13 PM
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Registered
Join Date: Sep 2009
Location: North of You
Posts: 9,160
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Do you have a stick welder? Ground the block and connect the bolt/stud to the electrode holder. Pulse the machine on and off to get the stud very hot.
This will concentrate the heat where you need it, far more effective than oxy-acetylene. Then douse it with oil.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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07-16-2011, 04:16 PM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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Quote:
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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07-16-2011, 04:23 PM
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Location: Michigan
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We gave up after a few hours of work. We never did find the cause of the noise he's hearing anyway.
He's going to drop the case off to a local shop to get the bolts removed. Thanks for the suggestions fellas!!
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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07-16-2011, 06:32 PM
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MazdaSpeed3
